Description: This function allows the user to change the color of a part.
Usage:
1. DSI prompts:
> SELECT PART TO CHANGE COLOR
> PICK AN ELEM OR PART NAME OF A PART
2. Once the user selects the target part, DSI prompts:
> PART xxxx (part name) IS SELECTED
> SELECT COLOR FROM COLOR BAR OR EXIT
• The user selects the desired color from the color bar.